An optical fiber cable management panel includes drawer assemblies, each including a drawer slidable within a chassis. The drawer assemblies are secured together by a bracket that includes an interlock arrangement with the chassis. Such an interlock arrangement includes a non-threaded stud engaging a hole. radius limiters may be part of the drawer assembly and include a cable entry aperture have a closed perimeter and a flared cable guide surface around most of, and preferably all of, the closed perimeter to allow for the entry of cables from all directions. A control mechanism controls movement of the radius limiter relative to the drawer assembly. The control mechanism includes a rotating member that has an axis of rotation transverse to the slidable motion of the radius limiter and normal to the radius limiter.
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20. In an optical fiber cable management system having a drawer assembly; the drawer assembly including a drawer slidably received by a chassis, a method for controlling slidable movement of a cable radius limiter relative to slidable movement of the drawer within the chassis; the method comprising:
(a) rotating a wheel, secured to the cable radius limiter, between the drawer and the chassis;
(i) the wheel having an axis of rotation that is normal to the cable radius limiter.
11. A method of connecting a first drawer assembly to a second drawer assembly in an optical fiber cable management system; the method comprising:
(a) providing a first an second drawer assembly; the first drawer assembly including a first drawer slidably received by a first chassis; the second drawer assembly including a second rawer slidably received by a second chassis;
(i) the first chassis and first drawer defining a first storage interior for holding optical fiber cable;
(ii) the second chassis and second drawer defining a second storage interior for holding optical fiber cable; and
(b) securing a bracket to the first chassis and the second chassis by inserting a non-threaded stud arrangement into an aperture arrangement.
13. An optical fiber cable management panel comprising:
(a) a drawer assembly including a chassis and a drawer;
(i) said drawer being slidably mounted within said chassis;
(ii) said drawer assembly defining a storage interior and a first cable access entry to permit optical fiber cable to enter into said storage interior;
(b) a cable radius limiter slidably mounted relative to said drawer assembly; and
(c) a control mechanism secured to said drawer assembly to synchronize slidable movement of said cable radius limiter relative to slidable movement of said drawer within said chassis;
(i) said control mechanism including a rotating member oriented to rotate between said drawer and said chassis;
(ii) said rotating member having an axis of rotation that is normal to said cable radius limiter.
6. A method of limiting a radius of optical fiber cables; the method comprising:
(a) providing a radius limiter including:
(i) a frame piece including a vertically oriented continuous curved wall; and a continuous trough section adjacent to the curved wall;
(ii) a cover member oriented at least partially over the trough section;
(A) the cover member defining at least a portion of a perimeter of a cable entry aperture;
(B) the portion of the perimeter of the cable entry aperture defined by the cover having a flared cable guide surface;
(1) all of the perimeter of the cable entry aperture being circumscribed by the flared cable guide surface;
(b) directing optical fib r cables through the cable entry aperture and against the flared cable guide surface of the cover member; and
(c) after said step of directing, orienting the optical fiber cables within the continuous trough section and against the continuous curved wall.
24. A radius limiter for an optical fiber cable management panel; the radius limiter comprising:
(a) a frame piece including a vertically oriented curved wall; and a trough section adjacent to said curved wall;
(i) said curved all being concavely shaped relative to said trough section;
(b) a cover member oriented at least partially over the trough section;
(i) said cover member and said frame piece defining a cable entry aperture having a closed perimeter;
(A) said cable entry aperture being in communication with said trough section to permit cables to enter through the aperture and rest within the trough section;
(B) at le st 75% of said perimeter of said cable entry aperture being circumscribed by a flared cable guide surface;
(C) said cover member including a finger;
(ii) said finger including an attachment portion pivotally securing said finger to said frame piece; and
(A) said attachment portion comprises a pair of tabs projecting from said finger.
1. A radius limiter for an optical fiber cable management panel; the radius limiter comprising:
(a) a frame piece including a vertically oriented continuous curved wall; and a continuous trough section adjacent to said curved wall;
(i) said curved wall being concavely shaped relative to said trough section;
(ii) said trough section being defined by a vertically oriented wall and a base;
(A) said base bridging said vertically oriented wall and said curved wall;
(B) said base being continuous with said vertically oriented wall and said curved wall;
(b) a cover member oriented at least partially over the trough section;
(i) said cover ember and said frame piece defining a cable entry aperture having a closed perimeter;
(A) said cable entry aperture being in communication with said trough sect on to permit cables to enter through the aperture and rest within the trough section;
(B) all of said perimeter of said cable entry aperture being circumscribed by a flared cable guide surface.
9. An optical fiber cable management system comprising:
(a) a first drawer assembly including a first chassis and a first drawer slidably mounted within said first chassis;
(i) said first chassis and first drawer defining a first storage interior;
(ii) said first drawer assembly defining a first cable access entry to permit optical fiber cable to enter into said first storage interior;
(b) a second drawer assembly including a second chassis and a second drawer slidably mounted within said second chassis;
(i) said second chassis and second drawer defining a second storage interior;
(ii) said second rawer assembly defining a second cable access entry to permit optical fiber cable to enter into said second storage interior; and
(c) a mounting bracket connecting together at least said first drawer assembly and said second drawer assembly through an interlock arrangement;
(i) said interlock arrangement including:
(A) a plurality of non-threaded stud members in one of: (i) said mounting bracket; and (ii) said first and second chassis; and
(B) a plurality of holes sized for receiving said non-threaded stud members; said plurality of holes being defined by one of (i) said mounting bracket; and (ii) said first and second chassis.
27. A method of limiting radius of optical fiber cables; the method comprising:
(a) providing a radius limiter including:
(i) a frame piece including a vertically oriented continuous curved wall; and a continuous trough section adjacent to the curved wall;
(ii) a cover member oriented at least partially over the trough section;
(A) the cover member defining at least a portion of a perimeter of a cable entry aperture;
(B) the portion of the perimeter of the cable entry aperture defined by the cover having a flared cable guide surface;
(b) pivoting the cover member relative to the frame piece by releasing a latch connection between the cover member and the frame piece;
(i) the step of pivoting including rotating the cover member about a hinge point between the cover member and the frame piece;
(A) said step of rotating the cover member about a hinge point includes rotating a pair of tabs projecting from the cover member about a port on of the frame piece;
(c) directing optical fiber cables through the cable entry aperture and against the flared cable guide surface of the cover member; and
(d) after said step of directing, orienting the optical fiber cables within the continuous trough section and against the continuous curved wall.
22. A radius limiter for an optical fiber cable management panel; the radius limiter comprising:
(a) a frame piece including a vertically oriented curved wall; and a trough section adjacent to said curved wall;
(i) said curved all being concavely shaped relative to said trough section;
(ii) said trough section being defined by a vertically oriented wall and a base;
(A) said ase bridging said vertically oriented wall and said curved wall
(b) a cover member oriented at least partially over the trough section;
(i) said cover member and said frame piece defining a cable entry aperture having a closed perimeter;
(A) said cable entry aperture being in communication with said trough section to permit cables to enter through the aperture and rest within the trough section;
(B) at least 75% of said perimeter of said cable entry aperture being circumscribed by a flared cable guide surface;
(C) said cover member including a finger defining at least one free edge;
(1) said free edge defining a portion of said flared guide surface;
(2) said finger including a second free edge selectively engaging said vertically oriented wall of said trough section;
(c) a latch arrangement releasably securing said finger to said frame piece;
(i) said latch arrangement being mounted on said vertically oriented wall and said second free edge to releasably secure said finger to said frame piece;
(ii) said finger including an attachment portion pivotally securing said finger to said frame piece; and
(A) said attachment portion comprises a pair of tabs projecting from said finger.
2. A radius limiter according to
(a) said cover member includes a finger defining at least one free edge;
(i) said free edge defining a portion of said flared guide surface.
3. A radius limiter according to
(a) a latch arrangement releasably securing said finger to said frame piece.
4. A radius limiter according to
(a) said finger includes a second free edge selectively engaging said vertically oriented wall of said trough section;
(i) said latch arrangement being mounted on said vertically oriented wall and said second free edge to releasably secure said finger to said frame piece.
5. A radius limiter according to
(a) said finger includes an attachment portion pivotally securing said finger to said frame piece.
7. A method according to
(a) before said step of directing, pivoting the cover member relative to the frame piece by releasing a latch connection between the cover member and the frame piece.
8. A method according to
(a) said step of pivoting includes rotating the cover member about a hinge point between the cover ember and the frame piece.
10. An optical fiber cable management system according to claim wherein:
(a) said interlock arrangement includes:
(i) at least two of said non-threaded stud members projecting from said first chassis;
(ii) at least two of said non-threaded stud members projecting from said second chassis; and
(iii) at least four of said holes defined by said mounting bracket receiving each of the non-threaded stud members of said first chassis and said second chassis.
12. A method according to
(a) said step of securing includes inserting a plurality of non-threaded studs projecting from each of the first chassis and the second chassis into a plurality of holes sized to receive the non-threaded studs defined by the bracket.
14. An optical fiber cable management panel according to
(a) said control mechanism includes a bracket and an axle;
(i) said rotating member being mounted for rotation on said axle.
15. An optical fiber cable management panel according to
(a) said rotating member includes a wheel.
16. An optical fiber cable management panel according to
(a) said bracket includes a projection arrangement secured to said cable radius limiter.
17. An optical fiber cable management panel according to
(a) said drawer includes a base defining an elongated slot;
(i) said bracket being secured to said cable radius limiter through said elongated slot.
18. An optical fiber cable management panel according to
(a) said drawer further includes a wheel guide secured thereto having a guide surface extending normal to said drawer base;
(b) said chassis includes a base in a plane generally parallel to said drawer base; said chassis further includes a sidewall extending normal to said chassis base;
(i) said wheel oriented for rotation between and against said guide surface and said chassis sidewall.
19. An optical fiber cable management panel according to
(a) said bracket includes a catch;
(b) said chassis include a stop member;
(i) said catch selectively engaging said stop member when said drawer and said radius limiter are slid relative to said chassis.
21. A method according to
(a) the wheel is mounted on a bracket; the drawer includes a base defining an elongated slot; the racket is secured to the cable radius limiter through the elongated slot; the drawer further includes a wheel guide surface extending normal to the drawer base; the chassis includes a base in a plane generally parallel to the drawer base; the chassis further includes a sidewall extending normal to the chassis base; and
(b) said step of rotating a wheel between the drawer and the chassis includes rotating the wheel between and against the guide surface and the chassis sidewall.
23. A radius limiter according to
(a) all of said perimeter of said cable entry aperture is circumscribed by said flared cable guide surface.
25. A radius limiter according to
(a) said finger defines at least one free edge;
(i) said free edge defining a portion of said flared guide surface.
26. A radius limiter according to
(a) a latch arrangement releasably securing said finger to said frame piece.
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This disclosure concerns management of optical fiber cables. In particular, this disclosure relates to storage of optical fiber cables and devices in the telecommunications industry.
Cable termination, splice, and storage devices are known including, for example, devices shown in U.S. Pat. Nos. 4,792,203 and 5,946,440, both assigned to ADC Telecommunications, Inc. Both of these patents concern devices with movable trays for storage and management of the optical fiber cables. U.S. Pat. No. 5,066,149, also assigned to ADC Telecommunications, concerns a cable management device including slidable drawers, each including a cable slack take-up mechanism. When moving the trays or drawers, unnecessary or excessive displacement of the optical fiber cables is undesirable. As the optical fiber cables are displaced, they are subject to bending and other forces. Bending of the fibers can cause attenuation and loss of signal strength. As the fiber bends, the fiber can also break, resulting in a loss of transmission through the fiber. Improvements are desirable.
In one aspect, the disclosure describes a radius limiter for an optical fiber cable management panel. The radius limiter includes a frame piece having a vertically oriented curved wall and a trough section adjacent to the curved wall. A cover member is oriented at least partially over the trough section. The cover member and the frame piece define a cable entry aperture having a closed perimeter. The cable entry aperture is in communication with the trough section to permit cables to enter through the aperture and rest within the trough section. Further, at least 75% of the perimeter of the cable entry aperture is circumscribed by a flared cable guide surface.
A method of limiting a radius of optical fiber cables is provided and includes directing optical fiber cables through a cable entry aperture and against a flared cable guide surface of a cover. The cover is oriented at least partially over a trough section of a frame piece that is part of a radius limiter.
In another aspect, this disclosure concerns an optical fiber cable management system including at least first and second drawer assemblies. Each of the drawer assemblies includes a chassis and a drawer slidably mounted within the chassis. A mounting bracket is provided to connect together the first drawer assembly and the second drawer assembly through an interlock arrangement. The mounting bracket also is usable to connect together more than two drawer assemblies. The interlock arrangement includes non-threaded stud members and holes sized for receiving the non-threaded stud members.
A method of connecting a first drawer assembly to a second drawer assembly includes securing a bracket to the chassis of the first drawer assembly and the chassis of the second drawer assembly by inserting a non-threaded stud arrangement into an aperture arrangement.
In another aspect, this disclosure is directed to an optical fiber cable management panel including a drawer assembly, including a drawer slidably mounted within a chassis, a cable radius limiter slidably mounted relative to the drawer assembly, and a control mechanism secured to the drawer assembly to synchronize slidable movement of the cable radius limiter relative to slidable movement of the drawer within the chassis. The control mechanism includes a rotating member oriented to rotate between the drawer and the chassis. The rotating member has an axis of rotation that is transverse to a direction of slidable movement of the cable radius limiter.
A method for controlling slidable movement of a cable radius limiter relative to slidable movement of a drawer within a chassis includes rotating a wheel, secured to the cable radius limiter, between the drawer and the chassis. The wheel has an axis of rotation that is oriented normally to the cable radius limiter.
A cable management panel or module is depicted in
Each drawer 36 may include cable management structure, for example, devices for storing the cables or connecting the cables to other cables or fiber optic devices, such as attenuators, couplers, switches, wave division multiplexers, splitters or splices. Drawers 36 are slidable relative to chassis 34 by way of two drawer slides 38 on opposite sides of the chassis 34. Each drawer 36 includes two latches 40 to secure the drawer 36 in a closed position (the position shown in FIG. 1).
Each drawer 36 includes a base 42, a front wall 44 and a rear wall 46. Note that the drawer 36 is absent of side walls, or is “side wall-free.” This structure allows for cable entry and exit and prevents cable damage during sliding movement of the drawers 36 when accessing the cables and connectors or other devices in the drawer 36. The base 42, front wall 44 and rear wall 46 together define a storage interior 48 for holding and storing the cables.
Each storage interior 48 is sized for receiving cable management and/or distribution structures. When the drawer 36 is in the closed position, the cables and management or distribution structures in the storage interior 48 are protected. In preferred embodiments, the distribution structures can be conveniently mounted on a tray insert that drops into the storage interior 48. This allows for convenient structuring of the drawer 36 to serve one or more desired functions in the panel 30. Examples of tray inserts are described in co-pending and commonly assigned U.S. patent application Ser. No. 09/649,398, which is a continuation-in-part of application Ser. No. 09/490,379 (also co-pending and commonly assigned), each of which is incorporated by reference herein. In the preferred embodiment illustrated, each of the drawers 36 is constructed to be stackable and linkable to form sub-cable management panels 31. Such modularity also allows for ease of use for a variety of different needs for the cable management system. As can be seen in
In prior arrangements, mounting brackets were attached to the side chassis with each drawer with several screws, for example, #4-40 UNC screws. It was found that if drawers connected together in this manner were dropped, the bracket would become loose from the drawers, leading to wobble between drawers in a multiple drawer assembly. Further, when the drawers would be opened, there sometimes would be rubbing and scraping if the drawers were loose from the bracket. The bracket 50, as described herein, addresses these problems.
In particular, the mounting bracket 50 connects together each of the drawer assemblies 32 through an interlock arrangement 52. In preferred embodiments, the interlock arrangement 52 includes at least one, and preferably a plurality, of non-threaded stud members 54 located in one of the mounting bracket 50 and the chassis 34. Further, the interlock arrangement 52 includes at least one, and preferably a plurality, of apertures or holes 56 sized for receiving the non-threaded stud members 54. The plurality of holes 56 are defined by the other of the mounting bracket 50 and the chassis 34.
In the particular embodiment illustrated, the interlock arrangement 52 includes two non-threaded stud members 54 projecting from the chassis 34 (see FIGS. 13-14). The stud members 54 may be formed from the chassis 34 itself (by punching or forming), or may be independent members permanently secured to the chassis 34. In this illustrated embodiment, the interlock arrangement 54 includes at least 4 holes being defined by the mounting bracket 50, receiving each of the non-threaded stud members 54 of each of the chassis 34. These holes 56 are visible in
In general, the bracket 50 includes first and second mounting plates 60, 61 arranged generally orthogonal to each other. The first mounting plate 60 is utilized for securing each of the chassis 34 together. The second mounting plate 61 is used to mount each of the drawer assemblies 32 together along other framework, typically together with other cable management panels 30. Each of the holes 56 is defined by and extends completely through the first mounting plate 60. The first mounting plate 60 also includes several more holes 62 for accommodating screws 64, as used in prior arrangements, to help secure each of the drawer assemblies 32 together to the bracket 50.
The chassis 34 is illustrated in
While non-threaded stud members 54 are illustrated in the preferred embodiment, it should be understood that, in alternate arrangements, pins may also be used. Further, in other embodiments, the interlock arrangement 52 may include a tab/slot arrangement, where a tab projects into and is bent over a slot.
Preferably, each of the drawer assemblies 32 includes a take-up mechanism 70 to manage optical fibers entering and exiting the cable management panel 30. In the preferred embodiment illustrated, each take-up mechanism 70 includes a push member or radius limiter 72. In reference now to
Still in reference to
The cable entry aperture 86 defines a closed perimeter 88. By “closed perimeter”, it is meant that the border that forms the aperture 86 is at least 90%, preferably 100%, closed to form a continuous, uninterrupted boundary. In the preferred embodiment illustrated, at least 75%, preferably at least 95%, and in most preferred embodiments, 100% of the perimeter 88 of the cable entry aperture 86 is circumscribed by a flared cable guide surface 90. The flared cable guide surface 90 preferably takes the form of a smooth, contour 92, such that the cable entry aperture 86 has the appearance of a trumpet flare or a bell-mouth 94. The smooth contour 92 preferably is bent on a radius of about 0.25-0.75 in. The flared cable guide surface 90 helps to protect cables entering the cable entry aperture 86 and prevents such cables from bending too sharply and possibly losing some light transmission.
As can be seen particularly in
In reference now to
The attachment portion 104 helps to pivotally secure the finger 96 to the frame piece 74. In reference to
The latch arrangement 106 provides for a secure interlock between the finger 96 and the frame piece 74 to prevent unintended bending away of the finger 96 from the frame piece 74 if fibers or cables tend to pull it up during manipulation of the drawer assembly 32. In preferred embodiments, the hinge point 118 permits selective lifting of the cover member 84 away from remaining portions of the radius limiter 72 to facilitate fiber loading.
The cover member 84 may also include a second finger 100 (FIGS. 11 and 18). Finger 100, in the one shown, is oriented generally at a right angle to the finger 96 and is pivotally mounted relative to the frame 74. Finger 100 also helps to hold the cables in place within the radius limiter 72.
To load cable or fiber into the radius limiter 72, the latch arrangement 106 is released to allow the finger 96 to be moved relative to the frame 74. The finger 96 is pivoted about the hinge point 118 that defines a gap or space through which the cable may enter. If present, the second finger 100 is also pivoted away from the frame 74. The cable is then oriented and rested within the trough section 78. The finger 96 is again oriented against the frame piece 74 to close the gap or space, and the latch arrangement 106 is secured by having the projection 112 extend into the aperture 111 of the hook 110. If present, the second finger 100 is returned against the frame 74. If cable is being directed from a position above the radius limiter 72, the cable is resting against the flared cable guide surface 90 defined by the first free edge 98 of the finger 96. As described above, the flared cable guide surface 90 helps to prevent the cable from bending too sharply. Further, as explained above, the shape of the trough section 78 also controls the radius of the cable and prevents it from bending too sharply.
The radius limiter 72 is preferably slidably mounted relative to the drawer assembly 32. Movement of the radius limiter 72 is controlled with synchronized movement with the drawer 36 to ensure that the cables do not bend too sharply when the drawer 36 is being opened or closed relative to the chassis 34. If the cables were bent too sharply, this may cause loss of signal strength or loss of transmission. Preferably, the cable management panel 30 includes a control mechanism 125 (
Preferably, the wheel 128 is oriented to rotate between the drawer 36 and the chassis 34. In most preferred embodiments, the wheel 128 has an axis of rotation 130 that is transverse to a direction of slidable movement of the cable radius limiter 72. This is illustrated in FIG. 16. In
In reference now to
Still in reference to
The bracket 134 also includes a catch 152 projecting from a side and in a direction opposite to the direction that the projection arrangement 138 projects. In the one shown, the catch 152 defines one end 154 of the bracket 134. Also, in the particular embodiment illustrated, the first projection 140 forms an opposite end 156 of the bracket 134. The catch 152 is selectively engaged with a stop member 158 on the chassis 34. The catch 152 of the bracket 134 selectively engages the stop member 158 when the drawer 36 and the radius limiter 72 are slid relative to the chassis 34. This engagement prevents the drawer 36 from being totally separated from the chassis 34 when sliding the drawer 36 from the chassis 34.
In reference again to
Secured to the drawer 36 is a wheel guide 164. The wheel guide 164 is a generally elongated structural member defining a smooth guide surface 165. As can be seen in
In operable assembly, the wheel 128 rotates about its axle 136 between and against the guide surface 165 of the wheel guide 164 and the chassis side wall 162. The location of the wheel 128 secured to the radius limiter 72 and between the drawer 36 and chassis 34 allows the radius limiter 72 to move at one-half of the speed of the movement of the drawer 36 relative to the chassis 34.
In reference again to
When the drawer 36 is slid relative to the chassis 34, the wheel 128 is rotated between the drawer 36 and chassis 34 (in particular, between the wheel guide 164 and the side wall 162 of the chassis 34), and the wheel 128 is rotated about the axis of rotation 130 that is transverse to the direction of slidable movement of the cable radius limiter 72, and that is oriented normally to the radius limiter 72.
The above specification provides a complete description of example embodiments of the invention. Many embodiments of the invention can be made, according to principles described herein.
Smith, Trevor D., Franklin, Michael J., Douglas, Joel B., Barnes, Kathleen M., Hannah, Lonnie E., Trebesch, Steven P.
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